NF ZM2376 - Page 207

7.1 Specification
7-11 ZM2376
• Other conditions
Warm-up 30 min or more
Zero correction Execute OPEN correction and SHORT correction.
Cable Length Correction Execute according to the connection cable length.
Calibration cycle 1 year
• Measurement accuracy of measurement parameters except Z and θ
From the measurement accuracy of impedance, obtain as follows.
Here, Qx is a measured value of Q, Dx is a measured value of D, and x is a measured value of .
x used for accuracy calculation may be obtained from (90
°
- tan
-1
|1/Qx|) or (90
°
- tan
-1
|Dx|).
Parameter
Measurement accuracy
|Y|
±Az [%]
Lp, Ls, X
±Az [%] (|Qx|≥10), ±Az / sinθx [%] (|Qx| < 10)
Cp, Cs, B
±Az [%] (|Dx|≤0.1), ±Az / sinθx [%] (|Dx| > 0.1)
Rp, Rs, G
±Az [%] (|Qx|≤0.1), ±Az / cosθx [%] (|Qx| > 0.1)
Rdc
±Az [%]
Q
±Qx
2
× Pe / ( 1 - |Qx| × Pe ) (|Qx|≥10,|Qx|× Pe ≤0.1)
Here, the phase angle error Pe[rad] = 0.01 × Az[%]. It differs from Pz[°].
Measurement accuracy of Q is absolute value. It is not a % value.
D
±(0.01 × Az) (|Dx|≤0.1)
Measurement accuracy of D is absolute value. It is not a % value.
In general, a range of each measurement parameter (maximum value and minimum value) can be
calculated based on an error circle of the impedance.

 = 2 ×  × Measurement frequency[Hz]. Suffix “x” of a parameter indicates a measured value.
Figure 7-1 Range of error
|Zx|
Rsx
Lsx = Xx
= -1/(Csx)
x
Az [%]
±Az / cos(x) [%]
±Az / sin(x) [%]
Qx = tan(x)
x: 0180°
Phase
accuracy
|Yx|
Gx = 1 / Rpx
Cpx = Bx
= -1/(Lpx)
x
Az [%]
±Az / cos(x) [%]
±Az / sin(x) [%]
c
Dx = tan(c)
c: ±90°
Phase
accuracy